The eye of a Primula flower is its center which may be colored different from the rest of the corolla and which is the mouth or end of the flower tube containing the stigma or anthers (see Style Position).In Primula, whether the flower is annulate or exannulate is an important characteristic to differentiate between species.

Close-up of the annulus in a Primula flower

Annulate means having a ring-like constriction (annulus) at the mouth of the flower. A different colored eye from the rest of the corolla does not indicate that an annulus is present. Some species even may be weakly annulate or sometimes exannulate. Exannulate is the opposite; no annulus is present. The best way to determine whether an annulus is present is to slice open the flower.
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Submissions

If you have photographs of Primula in the wild, please consider contacting the webmaster for identifications and for possible inclusion in the Species Gallery. See the Image Submissions page for more details.